CN112216774A

CN112216774A - Color conversion assembly, display panel and manufacturing method

Info

Publication number: CN112216774A
Application number: CN201910625722.9A
Authority: CN
Inventors: 王岩
Original assignee: Chengdu Vistar Optoelectronics Co Ltd
Current assignee: Chengdu Vistar Optoelectronics Co Ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2021-01-12
Also published as: WO2021004090A1; KR20220008378A

Abstract

The invention relates to a color conversion assembly, a display panel and a manufacturing method, wherein the color conversion assembly comprises: the light conversion layer comprises a wall blocking layer and at least one light conversion unit; the light conversion unit is arranged in the through hole, and can convert incident light into emergent light with a wavelength range different from that of the incident light; the retaining wall layer comprises more than two layers of blocking layers which are stacked along the first direction, so that emergent rays are gathered to the center of the through hole. The color conversion assembly, the display panel and the manufacturing method provided by the embodiment of the invention can meet the colorization requirement of the display panel and can avoid the color cast problem of the display panel under different viewing angles.

Description

Color conversion assembly, display panel and manufacturing method

Technical Field

The invention relates to the technical field of display, in particular to a color conversion assembly, a display panel and a manufacturing method.

Background

Flat Display panels, such as Liquid Crystal Display (LCD) panels, Organic Light Emitting Diode (OLED) panels, and Display panels using Light Emitting Diode (LED) devices, have advantages of high image quality, power saving, thin body, and wide application range, and are widely used in various consumer electronics products, such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and become the mainstream of Display devices.

The display panel may implement a display supporting color patterns through various colorization schemes. For example, colorization can be achieved by adding a light conversion layer having Quantum Dots (QDs), which can satisfy colorization requirements, but also causes problems such as color shift at different viewing angles when the display panel is colorized due to an unreasonable structural design of the light conversion layer.

Disclosure of Invention

The embodiment of the invention provides a color conversion assembly, a display panel and a manufacturing method, which can meet the colorization requirement of the display panel and can avoid the color cast problem of the display panel under different viewing angles.

In one aspect, a color conversion module according to an embodiment of the present invention includes: the light conversion layer comprises a wall blocking layer and at least one light conversion unit; the light conversion unit is arranged in the through hole, and can convert incident light into emergent light with a wavelength range different from that of the incident light; the retaining wall layer comprises more than two layers of blocking layers which are stacked along the first direction, so that emergent rays are gathered to the center of the through hole.

According to an aspect of the embodiment of the present invention, an opening of the through hole near the light incident side is smaller than an opening of the through hole near the light emergent side; and/or, in the first direction, the light reflection angle of the wall surface facing the through hole of the two or more barrier layers is increased.

According to an aspect of the embodiment of the invention, the surface of each barrier layer facing the through hole is an arc-shaped surface, and along the first direction, included angles between tangents of adjacent arc-shaped surfaces and the horizontal plane are sequentially increased.

According to one aspect of the embodiment of the invention, the radial dimension of one end, close to the light incident side, of the surface, facing the through hole, of each barrier layer is smaller than the radial dimension of one end, close to the light emergent side, of the surface, close to the through hole, of each barrier layer, so that the surface, facing the through hole, of each barrier layer is in a conical cylinder shape, and the included angles of the horizontal planes of the surfaces, facing the through hole, of the two adjacent barrier layers are the same or;

according to one aspect of the embodiment of the invention, along the first direction, the surfaces of the two or more barrier layers facing the through hole are connected end to end; or, along the first direction, the surfaces of the two adjacent barrier layers facing the through hole are connected by the transition surface and are respectively intersected with the transition surface, and the side wall of the through hole formed by enclosing is integrally in a step cylinder shape.

According to an aspect of the embodiment of the invention, the light conversion layer further includes a light reflecting layer disposed on a surface of each barrier layer facing the through hole; alternatively, each barrier layer is composed of a reflective material having a different reflectivity.

According to an aspect of the embodiment of the invention, the light conversion layer further includes a planarization layer, and the planarization layer is filled in the through hole.

According to an aspect of the embodiment of the present invention, the color conversion module further includes a bragg reflection layer, the bragg reflection layer is located on the light emitting side of the light conversion layer, and a projection of the bragg reflection layer on the light conversion layer covers each light conversion unit.

According to an aspect of an embodiment of the present invention, the color conversion assembly further includes a light scattering layer positioned at a side of the bragg reflection layer away from the light conversion layer.

According to an aspect of an embodiment of the present invention, the light scattering layer is one of a microlens and a scattering particle layer; alternatively, the surface of the light scattering layer facing the light conversion layer may be a concave-convex surface.

In another aspect, according to an embodiment of the present invention, there is provided a display panel including: the luminous layer comprises a plurality of luminous units and barriers, and the adjacent luminous units are mutually separated through the barriers; in the color conversion assembly, the color conversion assembly is arranged on the light emitting layer, and each light emitting unit is arranged opposite to one through hole.

In another aspect, a method for manufacturing a display panel according to an embodiment of the present invention is provided, including: providing a driving backboard with a light-emitting layer, wherein the light-emitting layer comprises a plurality of light-emitting units and barriers, and adjacent light-emitting units are separated from each other through the barriers; forming a color conversion component over the light emitting layer, comprising: forming a retaining wall layer on the light-emitting layer, wherein the retaining wall layer is provided with through holes corresponding to the light-emitting units and comprises more than two layers of barrier layers which are stacked so as to gather emergent light rays to the centers of the through holes; and forming the light conversion unit in at least part of the through hole during or after the forming of the retaining wall layer.

According to the color conversion assembly, the display panel and the manufacturing method provided by the embodiment of the invention, the incident light can be converted into the emergent light with the wavelength range different from that of the incident light through the light conversion unit, so that full-color display of the display panel is realized. Simultaneously, because the retaining wall layer is including the range upon range of more than two-layer barrier layer that sets up for the emergent ray homoenergetic after the reflection of the incident ray of different angles through corresponding barrier layer is gathered together to the through-hole center that corresponds, reduces the optical path difference of different emergent rays, and then avoids display panel to have the colour cast problem under different visual angles.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic top view of a color conversion assembly according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a partial cross-sectional structure of a color conversion assembly according to an embodiment of the invention;

FIG. 3a is a partial cross-sectional view of a light conversion layer of one embodiment of the present invention;

FIG. 3b is a schematic diagram of a partial top view of one of the barrier layers in accordance with an embodiment of the present invention;

FIG. 4 is a simplified diagram of a through hole shape of a light conversion layer according to an embodiment of the present invention;

FIG. 5 is a partial cross-sectional view of a light conversion layer of another embodiment of the invention;

FIG. 6 is a partial cross-sectional view of a light conversion layer of yet another embodiment of the invention;

fig. 7 is a partial sectional structural view of a light scattering layer according to an embodiment of the present invention;

fig. 8 is a partial sectional structural view of a light scattering layer according to another embodiment of the present invention;

fig. 9 is a partial sectional structural view of a light scattering layer according to still another embodiment of the present invention;

fig. 10 is a schematic partial sectional view of a display panel according to an embodiment of the present invention;

FIG. 11 is a schematic enlarged view of a portion of a display panel according to an embodiment of the invention;

FIG. 12 is a flowchart illustrating a method of fabricating a display panel according to an embodiment of the present invention;

fig. 13a to 13s are schematic structural diagrams corresponding to steps of a method for manufacturing a display panel according to an embodiment of the present invention.

Wherein:

100-a color conversion component; 200-a cover plate assembly;

10-driving the back plate;

20-a light-emitting layer; 21-a light-emitting unit; 22-a barrier; 23-a planarization layer;

30-a light conversion layer; 31-a retaining wall layer; 31a, 31b, 31 c-barrier layers; 311 a-a receiving groove; 312-a through-hole; 32-a light conversion unit; 321-a red conversion unit; 322-green conversion unit;

40-a light-reflecting layer;

50a, 50b, 50 c-a planarization layer;

60-cover plate; 70-bragg reflector layer; 80-a light scattering layer; 81-planarization layer

X-a first direction.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.

For a better understanding of the present invention, the color conversion assembly, the display panel and the manufacturing method according to the embodiments of the present invention are described in detail below with reference to fig. 1 to 13.

Referring to fig. 1, fig. 1 is a schematic top view illustrating a color conversion assembly according to an embodiment of the invention, and fig. 2 is a schematic partial cross-sectional view illustrating the color conversion assembly according to the embodiment of the invention.

According to an embodiment of the present invention, there is provided a color conversion module 100 including a light conversion layer 30, the light conversion layer 30 including a barrier layer 31 and at least one light conversion unit 32. The through hole 312 is formed in the blocking wall layer 31, and the through hole 312 penetrates through the blocking wall layer 31 in the first direction X from the light incident side to the light emitting side of the light conversion layer 30. The at least one light conversion unit 32 is disposed in the at least one through hole 312, and the light conversion unit 32 can convert incident light into emergent light with a wavelength range different from that of the incident light, wherein the retaining wall layer 31 includes two or more barrier layers stacked along the first direction X, for example, in some optional examples, the two or more barrier layers may include a barrier layer 31a, a barrier layer 31b, and a barrier layer 31c, so as to gather the emergent light toward the center of the through hole 312. In some embodiments, the number of the light conversion units 32 may be one, two or more, and the number of the through holes 312 may also be one, two or more. The number of the light conversion units 32 may be less than or equal to the number of the through holes 312, that is, one light conversion unit 32 is disposed in each through hole 312, or only some of the through holes 312 are disposed with the light conversion units 32.

The color conversion assembly 100 provided in the embodiment of the invention can convert the incident light into the emergent light with a wavelength range different from that of the incident light through the light conversion unit 32, thereby realizing full-color display of the display panel to which the color conversion assembly 100 is applied.

Meanwhile, because the blocking wall layer 31 includes more than two layers of blocking

layers

31a, 31b and 31c which are stacked, the emergent rays of the incident rays at different angles after being reflected by the corresponding blocking layers can be gathered to the center of the corresponding through hole 312 to achieve collimation, namely, the emergent rays can be emergent roughly along the first direction X, the optical path difference of the rays at different emergent angles is reduced, and the problem of color cast of the display panel under different visual angles is avoided.

The color conversion assembly 100 provided in the embodiment of the present invention can be applied to a micro-rolled display technology, and certainly, can also be applied to the technical fields of LCD display technology, OLED display technology, and the like, and for better understanding of the color conversion assembly 100 in the embodiment of the present invention, the application to the micro-rolled display technology will be exemplified below.

Optionally, in the first direction X, the number of barrier layers included in the barrier layer 31 of the color conversion assembly 100 may be set according to the angle of the incident light and the reflection requirement, as long as it can better ensure that the emergent light can be gathered and emitted toward the center of the through hole 312, and reduce the requirement of the optical path difference of the light with different emergent angles.

Optionally, the light emitting element generating the incident light may be a blue micro-led chip, and in order to meet the requirement of colorization display, the light conversion unit 32 may include a red conversion unit and a green conversion unit, the red conversion unit converts the light of the light emitting element corresponding to the red conversion unit into a red sub-pixel, the green conversion unit converts the light of the light emitting element corresponding to the green conversion unit into a green sub-pixel, and the light conversion unit 32 may not be disposed above at least a part of the light emitting units to maintain the original color of the light emitting element, so as to form a blue sub-pixel.

Wherein the red conversion unit includes a photoluminescent material for generating red light, for example, a material formed by mixing a red quantum dot with a photoresist or a material formed by mixing a red organic photoluminescent material with a photoresist. The green conversion unit includes a photoluminescent material for generating green light, for example, a material formed by mixing a green quantum dot with a photoresist or a material formed by mixing a green organic photoluminescent material with a photoresist. The photoresist is negative photoresist, and the quantum dot components can be inorganic nanoparticles such as ZnS, ZnO, CdS and InP.

In some alternative embodiments, in the two or

more barrier layers

31a, 31b, and 31c of the retaining wall layer 31, each

barrier layer

31a, 31b, and 31c is provided with an accommodating groove 311a penetrating along the first direction X and disposed opposite to each light emitting element, and the accommodating grooves 311a disposed opposite to each

barrier layer

31a, 31b, and 31c together form a through hole 312.

The light conversion unit 32 may be filled in the receiving groove 311a of any one of the barrier layers 31a, 31b, and 31c and connected to the surface of the

barrier layer

31a, 31b, and 31c facing the through hole 312. In the first direction X, the size of the light conversion unit 32 may be smaller than or equal to the size of the barrier layer on which it is located, and of course, in some other examples, the light conversion unit may also be larger than the size of the barrier layer on which it is located and extend upward and/or downward into the next barrier layer, as long as the color conversion requirement of the incident light to the emergent light can be satisfied.

As an alternative embodiment, the light conversion unit 32 may be located in the lowest barrier layer 31a disposed near the light incident side of the light conversion layer 30 and located at the central point or the focal point of the bottom of the through hole 312, so as to increase the light conversion rate of the light conversion unit 32 for the corresponding incident light and reduce the risk of light leakage.

In some optional embodiments, along the first direction X, the size of the light conversion unit 32 is smaller than the depth of the through hole 312, so that the color conversion assembly 100 is easier to mold and the cost of the color conversion assembly is reduced on the basis of ensuring the requirement of the color display of the display panel and the requirement of convergence of emergent light.

Optionally, in the first direction X, the light-gathering capability of the two or more barrier layers 311 toward the center of the through hole 312 increases, and the effect of gathering the outgoing light toward the center of the through hole 312 is more easily satisfied.

Referring to fig. 3a, fig. 3b and fig. 4 together, fig. 3 shows a partial cross-sectional view of the light conversion layer 30 according to an embodiment of the invention, fig. 3b shows a partial top view of one of the barrier layers according to an embodiment of the invention, and fig. 4 shows a simplified diagram of the shape of the through hole 312 of the light conversion layer 30 according to an embodiment of the invention.

In some optional examples, in order to ensure the converging effect on the corresponding emergent light, optionally, in the first direction X, the light reflection angles of the two or more barrier layers toward the wall surface of the through hole 312 show increasing trend. For example, the light reflection angle M1 of the barrier layer 31a toward the wall surface of the through-hole 312 is smaller than the light reflection angle M2 of the barrier layer 31b toward the wall surface of the through-hole 312 is smaller than the light reflection angle M3 of the barrier layer 31c toward the wall surface of the through-hole 312. Through the setting, the gathering effect of the baffle wall layer 31 on the emergent rays can be optimized, the emergent rays can be closer to the emergent rays along the first direction X, the optical path difference between different emergent rays is further reduced, and the display effect is guaranteed.

It should be noted that the light reflection angles mentioned above and below refer to the angles between the outgoing light rays and their respective normal lines.

As an alternative embodiment, the opening of the through hole 312 near the light incident side of the light conversion layer 30 is smaller than the opening of the through hole 312 near the light emergent side of the light conversion layer 30. Through the arrangement, the reflection effect of incident light rays at different incident angles can be better ensured, so that the incident light rays at different angles can be gathered to the center of the through hole after being reflected by the light conversion layer 30, and the collimation and emergence requirements of the emergent light rays are better met.

In the color conversion module 100 provided by the above embodiments of the present invention, the retaining wall layer 31 may adopt various structural forms as long as the requirement for gathering the emergent light can be satisfied.

With reference to fig. 3a, fig. 3b and fig. 4, in some examples, a radial dimension of a surface of each of the blocking

layers

31a, 31b and 31c facing the through hole 312 near the light incident side is smaller than a radial dimension of a surface of each of the blocking

layers

31a, 31b and 31c facing the through hole 312 near the light emergent side, so that the surface of each of the blocking

layers

31a, 31b and 31c facing the through hole 312 is tapered.

The surface of each

barrier layer

31a, 31b, 31c facing the through hole 312 is a closed annular surface, and the projection of the surface in the first direction X may be an annular structure, for example, an annular structure or a polygonal annular structure, and when the surface is a polygonal annular structure, the mentioned radial dimension of the end near the light incident side refers to the radial dimension of an inscribed circle or a circumscribed circle projected by the end in the first direction. Similarly, the mentioned radial size of the end close to the light-emitting side refers to the radial size of an inscribed circle or a circumscribed circle projected by the end in the first direction.

For easier understanding, as shown in fig. 3b, taking the barrier layer 31a as an example, a surface of the barrier layer 31a facing the through hole 312 is a closed annular surface, a projection of the closed annular surface in the first direction X is a quadrilateral annular structure, which may be a regular quadrilateral structure, a radial dimension of a surface of the barrier layer 31a facing the through hole 312 near the light incident side is D1, a radial dimension of a surface of the barrier layer near the light emergent side is D2, and D1 is smaller than D2.

Through the arrangement, the requirement of collimation and emergence of incident light rays irradiated on the surface of each

barrier layer

31a, 31b and 31c can be ensured.

Optionally, along the first direction X, the surfaces of the two adjacent barrier layers facing the through hole 312 are connected by a transition surface and are respectively intersected with the transition surface, and the side wall of the through hole 312 formed by enclosing is integrally in a stepped cylinder shape. By enabling the retaining wall layer 31 to adopt the above structural form, namely, the shaping is convenient, and meanwhile, the surface of the retaining wall layer 31 facing each through hole 312 is an approximately arc-shaped reflecting surface shown in fig. 4, or the surface of the retaining wall layer 31 facing each through hole 312 is in a reflecting cup structure, so that the emergent light rays have a better gathering and collimating effect.

Optionally, along the first direction X, the included angles between the surfaces of the two adjacent barrier layers facing the through hole 312 and the horizontal plane are sequentially increased, that is, as shown in fig. 3a, the angle α is smaller than the angle β and smaller than the angle γ, so as to optimize the light condensing effect and achieve the purpose of collimating the emergent light.

Referring to fig. 5, fig. 5 is a partial cross-sectional view of a light conversion layer 30 according to another embodiment of the invention. Of course, the retaining wall layer 31 may be implemented in an alternative manner, in some other examples, the surface of each

barrier layer

31a, 31b, 31c of the retaining wall layer 31 facing the through hole 312 may still be in a conical cylinder shape, along the first direction X, the included angle between the surface of the adjacent two barrier layers facing the through hole 312 and the horizontal plane is the same, the surfaces of more than two barrier layers facing the through hole 312 are connected end to end along the first direction X, and the side wall enclosing the through hole 312 is in a smooth conical cylinder shape as a whole, which can also satisfy the gathering effect on the emergent light.

Referring to fig. 6, fig. 6 is a partial cross-sectional view of a light conversion layer 30 according to another embodiment of the invention. The surface of each

barrier layer

31a, 31b, 31c facing through hole 312 may be an arc surface, along the first direction X, the included angles between the tangent lines of adjacent arc surfaces and the horizontal plane increase in sequence, and the angle w is smaller than the angle y and smaller than the angle z. Through the arrangement, the gathering requirements of emergent rays of the light-emitting units 21 at all angles can be met, the display effect of the display panel is optimized, and the phenomenon of color cast is avoided. The horizontal plane mentioned above and below may be a flat surface perpendicular to the first direction X.

As an alternative implementation, referring to fig. 2 to fig. 6, in the color conversion device 100 provided in the above embodiments, the light conversion layer 30 further includes a reflective layer 40, the reflective layer 40 is disposed on the surface of each of the blocking

layers

31a, 31b, and 31c facing the through hole 312, and the reflective layer 40 is disposed to completely cover the surface of each of the blocking

layers

31a, 31b, and 31c facing the through hole 312, so as to improve the reflectivity of the light emitting unit 21, improve the convergence of the light, enable the light to be emitted in the vertical direction or the first direction X as far as possible, and further reduce the probability of color shift phenomenon generated by the display panel to which the color conversion device 100 is applied. In particular, the reflective layer 40 may be a metal layer.

It is understood that the color conversion assembly 100 provided by the embodiments of the present invention is not limited to the improvement of the reflectivity of the incident light by the reflective layer 40, and in some other examples, in the color conversion assembly 100 provided by the above embodiments of the present invention, the blocking

layers

31a, 31b, and 31c of the wall layer 31 are made of reflective materials with different reflectivities, which can also satisfy the requirement of increasing the light gathering ability of more than two blocking

layers

31a, 31b, and 31c toward the center of the through hole 312, and further better satisfy the requirements of gathering and collimating the light.

As an optional implementation manner, the color conversion device 100 provided in each of the above embodiments of the invention further includes the

planarization layers

50a, 50b, and 50c, the

planarization layers

50a, 50b, and 50c are filled in the through hole 312 and cover the light conversion layer 30, and by disposing the

planarization layers

50a, 50b, and 50c, the side of the light conversion layer 30 away from the light emitting layer 20 can be planarized, which is beneficial to the application of the color conversion device 100 in a display panel, and is also beneficial to the molding of the two or

more barrier layers

31a, 31b, and 31 c.

As an alternative implementation manner, the color conversion module 100 provided in each of the above embodiments of the present invention further includes a bragg reflection layer 70, the bragg reflection layer 70 is located on the light emitting side of the light conversion layer 30, and a projection of the bragg reflection layer 70 on the light conversion layer 30 covers each light conversion unit 32.

In the color conversion module 100 according to the embodiment of the present invention, the bragg reflection layer 70 is provided, so that the light emitted from the light conversion layer 30 is reflected and transmitted by the bragg reflection layer 70, and then full-color display is preferably achieved. For example, taking the light emitting element of the incident light as a blue micro-led as an example, the red light and the green light converted by the light conversion layer 30 can be transmitted through the bragg reflection layer 70, and the blue light which is not converted and is disposed opposite to the light conversion unit 32 can be reflected by the bragg reflection layer 70, so as to better ensure the colorized display effect of the display panel.

Referring to fig. 2, 7 to 9, fig. 7 to 9 are schematic partial cross-sectional views illustrating light scattering layers according to different embodiments of the invention. As an alternative implementation manner, the color conversion assembly 100 provided by each of the above embodiments of the present invention further includes a light scattering layer 80, the light scattering layer is located on a side of the bragg reflection layer 70 away from the light conversion layer 30, the light scattering layer 80 may be one of a microlens and a scattering particle layer, and of course, in some other examples, a surface of the light scattering layer 80 facing the light emitting layer 20 is a concave-convex surface. By providing the light scattering layer 80, the light gathered through the light conversion layer 30 can be further scattered, increasing the viewing angle of the display panel. In order to facilitate connection with the bragg reflection layer 70, the light scattering layer 80 may be provided with a planarization layer 81 on a side facing the bragg reflection layer 70.

It is understood that, the above is exemplified by using a blue micro-led chip as the light emitting unit corresponding to the incident light, which is an optional manner, in some other examples, the light emitting unit corresponding to the incident light may also use an ultraviolet micro-led, at this time, a light conversion unit 32 may be disposed in each through hole 312, and the plurality of light conversion units 32, including a red conversion unit, a green conversion unit, and a blue conversion unit, can also meet the requirement of the color conversion assembly 100 for colorization display.

Therefore, in the color conversion module 100 provided by the embodiment of the present invention, at least a part of the light emitted by the light emitting units 21 reaches the light conversion unit 32, and then can be converted by the light conversion unit 32, so that each display region of the color conversion module 100 at least includes three sub-pixels with different colors, thereby realizing colorized display. Meanwhile, the barrier layer 31 includes more than two

barrier layers

31a, 31b, 31c stacked in the thickness direction X, and the light-gathering capability of the more than two

barrier layers

31a, 31b, 31c toward the center of the through hole 312 increases from the light-emitting layer 20 to a direction away from the light-emitting layer 20, so that light rays emitted from the light-emitting unit 21 at different angles can be gathered toward the center of the corresponding through hole 312 through the reflection of the barrier layers 31a, 31b, 31c with different light-gathering capabilities, the optical path difference of the light rays at different emitting angles is reduced, and the color cast problem of the display panel at different viewing angles is avoided.

Referring to fig. 10 and fig. 11 together, fig. 10 is a schematic partial cross-sectional structure diagram of a display panel according to an embodiment of the invention, and fig. 11 is an enlarged partial schematic view of the display panel according to the embodiment of the invention.

The embodiment of the present invention further provides a display panel, which includes a light emitting layer 20 and the color conversion assembly 100 of the above embodiments, wherein the light emitting layer 20 includes a plurality of light emitting units 21 and a barrier 22, and adjacent light emitting units 21 are separated from each other by the barrier 22. The color conversion assembly 100 is disposed on the light emitting layer 20, and each light emitting unit 21 is disposed opposite to one of the through holes 312 of the color conversion assembly 100. The light emitted from the light emitting unit 21 can be used as the incident light of the color conversion assembly 100.

Optionally, the display panel may further include a driving backplane 10 disposed on a side of the light emitting layer 20 away from the color conversion assembly 100, the driving backplane 10 may include a substrate and a driving circuit disposed on the substrate, the driving circuit may be composed of devices such as thin film transistors, and the driving backplane 10 is also referred to as an array substrate.

The barriers 22 included in the light emitting layers 20 may be light-absorbing black matrixes, and the barriers 22 define a plurality of receiving portions, optionally, the receiving portions may have an inverted trapezoidal structure, and certainly, may also have a rectangular cross-section structure with a vertical edge, and here, no specific limitation is made as long as a blocking effect on adjacent light emitting layers 20 can be achieved. The side wall of the accommodating part can be provided with a reflecting layer, and the reflecting layer can be made of reflecting materials such as metal.

Alternatively, the light emitting units 21 may be distributed in an array, and a plurality of light emitting units 21 distributed in an array may be disposed in the accommodating portion and electrically connected to the driving circuit respectively, and controlled by the driving circuit. The barrier 22 is provided between adjacent light emitting units, so that the light emitted from the light emitting units 21 can be prevented from crosstalk with each other. The side wall of the barrier 22 facing the accommodating portion is provided with a reflective layer, which can improve the light reflection of the light emitting unit 21, improve the light output rate along the thickness direction X, and reduce the risks of side light leakage/mixing, resulting in low light utilization efficiency, color mixing, and the like.

The light emitting unit 21 may be a micro light emitting diode chip, in some alternative examples, the light emitting unit 21 may be a blue micro light emitting diode chip, and one light emitting unit 21 may be disposed in each accommodating portion, of course, two or more light emitting units 21 may also be disposed according to a size ratio of the accommodating portion to the light emitting unit 21, which is not limited herein. In order to facilitate the arrangement of the light conversion layer 30, optionally, the side of the light emitting layer 20 remote from the driving backplane 10 is provided with a planarization layer 23, such that the light emitting layer 20 has a planarized surface.

Further, for better protection of the color conversion assembly 100, optionally, a cover plate 60 is further disposed on a side of the color conversion assembly 100 away from the light emitting layer 20, and the color conversion assembly 100 is sandwiched between the cover plate 60 and the light emitting layer 20.

The display panel provided by each embodiment of the present invention, including the color conversion assembly 100 of each embodiment, can not only meet the requirement of color display, but also have a gathering function on the emergent light, so as to reduce the optical path difference of the light with different emergent angles, thereby avoiding the problem of color shift of the display panel under different viewing angles.

Referring to fig. 12, fig. 12 is a flowchart illustrating a method for manufacturing a display panel according to an embodiment of the invention.

As shown in fig. 12, an embodiment of the present invention further provides a method for manufacturing a display panel, including the following steps:

s100, providing a driving backplane 10 formed with a light emitting layer 20, where the light emitting layer 20 includes a plurality of light emitting units 21 and barriers 22 distributed in an array, and adjacent light emitting units 21 are separated from each other by the barriers 22.

S200, forming a color conversion assembly 100 on the light emitting layer 20, including: forming a retaining wall layer 31 on the light emitting layer 20, wherein the retaining wall layer 31 has through holes 312 corresponding to the light emitting units 21, and the retaining wall layer includes more than two layers of barrier layers stacked to gather the emergent light to the center of the through holes 312, and forming the light conversion unit 32 in at least part of the through holes 312 during or after the forming of the retaining wall layer 31.

Referring to fig. 13a to 13s together, fig. 13a to 13s are schematic structural diagrams corresponding to steps of a manufacturing method of a display panel according to an embodiment of the invention.

In step 100, as shown in fig. 13a to 13c, a driving backplane 10, which may be a glass plate, is first taken, a driving circuit is already fabricated on the driving backplane 10, and a light emitting unit 21, such as a blue micro-led, is fabricated on the backplane, so as to form the structure shown in fig. 13 a.

Then, the barriers 22, which may be light-absorbing black matrixes, or barrier structures with the reflective layer 40, are formed on the driving backplate 10 by printing or photolithography, and the reflective layer 40 is formed by metal evaporation to form the structure shown in fig. 13b and 13 c.

In step 200, as shown in fig. 13d, a planarization process is performed on the light emitting layer 20, specifically, a planarization layer 23 may be formed on the barrier 22 and the light emitting unit 21, and the planarization layer may be manufactured by printing or spin coating, so as to form a planarized surface on the light emitting layer 20, that is, the structure shown in fig. 13d is formed.

Further, as shown in fig. 13e to 13n, the steps may specifically include:

a first barrier layer 31a is formed on the planarized surface, and the first barrier layer 31a has an accommodation groove 311a disposed opposite to each light emitting cell 21, resulting in the structural form shown in fig. 13 e. In order to ensure the light reflection effect, a light reflection layer 40 may be disposed on the surface of the first barrier layer 31a facing its own accommodation groove 311a, forming a structure form as shown in fig. 13 f.

The light conversion unit 32 is formed in the plurality of receiving grooves 311a of the first barrier layer 31a, the light conversion unit 32 may include a red conversion unit 321 and a green conversion unit 322, which respectively correspond to the finally formed red and green pixels, the red and green conversion units may be photoresists or inks doped with red and green quantum dots, and may be manufactured by a printing process or a photolithography process, and then the first barrier layer 31a and the light conversion unit 32 are planarized to form the first planarization layer 50a of the light conversion layer 30, thereby forming the structural form shown in fig. 13g and 13 h.

A second barrier layer 31b is formed on the planarized first barrier layer 31a, specifically, the second barrier layer 31b is formed on the first planarization layer 50a, the second barrier layer 31b has a receiving groove 311a disposed opposite to each light emitting unit 21, the second barrier layer 31b is planarized, the second planarization layer 50b of the light conversion layer 30 is shaped, and the structure form shown in fig. 13i and 13k is formed. Similarly, in order to ensure the light reflection effect, a light reflection layer 40 may be disposed on the surface of the second barrier layer 31b facing its own accommodation groove 311a, forming a structure form as shown in fig. 13 j.

The above-mentioned barrier layer with the accommodating groove 311a disposed opposite to the light emitting unit 21 is disposed next to the last planarized barrier layer, and the planarization is repeated until the disposing and planarization of the nth barrier layer 311 are completed, where n is greater than or equal to 3, for example, in some alternative examples, a third barrier layer 31c may be formed on the second barrier layer 31b and planarized to form a planarization layer 50c, so as to form the structural form shown in fig. 13l to 13 n.

Each of the barrier layers 31a, 31b, and 31c and the receiving groove 311a disposed opposite to the same light emitting unit 21 together form one of the through holes 312, and the sidewall enclosing each through hole 312 may be in a cone shape, a step shape, or a smooth arc shape, and may be in a substantially arc shape of a reflecting cup, so that the trend of concentrating light from the light emitting layer 20 to the direction away from the light emitting layer 20 toward the center of the through hole 312 is increased by two or more barrier layers. The requirements of gathering and collimating the light of the light-emitting unit 21 are ensured.

In the above-mentioned forming of each

barrier layer

31a, 31b, 31c, before the

barrier layer

31a, 31b, 31c is planarized, the light reflecting layer 40 may be provided on the surface facing the respective receiving groove 311a, and the light reflecting layer may be formed by a metal vapor deposition process.

Further, as shown in fig. 13o to 13r, another cover plate 60, which may be a glass plate, is adopted to form the structure shown in fig. 13 o. For better light scattering, optionally, a light scattering layer 80 is formed on the cover plate 60, the light scattering layer 80 may be a micro lens, an uneven surface, or a scattering particle layer, and the like, and may be fabricated by nano-imprinting, surface etching, glue coating, photolithography, and the like, and the light scattering layer 80 is planarized, specifically, a planarization layer 81 is provided to form the structure shown in fig. 13p and 13q, and a bragg reflection layer 70 is formed on the planarized light scattering layer 80 to form the cover plate assembly 200, that is, the structure shown in fig. 13 r.

Further, as shown in fig. 13s, the cover plate assembly 200 is abutted to the color conversion assembly 100, and specifically, the cover plate assembly may be bonded by filling glue, so that the bragg reflection layer 70 is located between the light conversion layer 30 and the cover plate 60 to form the display panel.

According to the manufacturing method of the display panel provided by the embodiment of the invention, the manufactured and molded display panel can meet the requirement of colorized display and can overcome the problem of color cast. Meanwhile, the light conversion layer 30 is manufactured by layering the

multiple barrier layers

31a, 31b and 31c, so that the requirements on light reflection gathering and collimation can be met, and meanwhile, the display panel is easy to manufacture and mold, so that the display panel is easy to popularize and use.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A color conversion assembly, comprising: a light conversion layer including a barrier layer and at least one light conversion unit;

the light conversion unit is arranged in the through hole, and can convert incident light into emergent light with a wavelength range different from that of the incident light;

the barrier wall layer comprises more than two barrier layers which are stacked along the first direction, so that the emergent rays are gathered towards the center of the through hole.

2. The color conversion assembly of claim 1, wherein the opening of the through hole near the light incident side is smaller than the opening of the through hole near the light emergent side;

and/or, in the first direction, the light reflection angles of two or more barrier layers toward the wall surface of the through hole show an increasing tendency.

3. The color conversion assembly of claim 1, wherein the surface of each barrier layer facing the through hole is an arc-shaped surface, and the included angles between the tangent lines of the adjacent arc-shaped surfaces and the horizontal plane are sequentially increased along the first direction.

4. The color conversion assembly according to claim 1, wherein the radial dimension of the end of the barrier layer facing the through hole and close to the light incident side is smaller than the radial dimension of the end close to the light emergent side, so that the surface of the barrier layer facing the through hole is in a cone shape, and the included angles between the surfaces of the barrier layers facing the through hole and the horizontal plane are the same or sequentially increased along the first direction;

preferably, along the first direction, two or more barrier layers are connected end to end towards the surface of the through hole; or, along the first direction, the surfaces of the two adjacent barrier layers facing the through hole are connected by a transition surface and are respectively intersected with the transition surface, and the side wall of the through hole is integrally in a stepped cylinder shape.

5. The color conversion assembly of any of claims 1 to 4, wherein the light conversion layer further comprises a light reflecting layer disposed on a surface of each of the barrier layers facing the through-hole;

alternatively, each of the barrier layers is composed of a reflective material having a different reflectivity.

6. The color conversion device according to any one of claims 1 to 4, wherein the light conversion layer further comprises a planarization layer, and the planarization layer is filled in the through hole.

7. The color conversion package according to any one of claims 1 to 4, wherein the color conversion package further comprises a Bragg reflection layer, the Bragg reflection layer is located on the light emitting side of the light conversion layer, and a projection of the Bragg reflection layer on the light conversion layer covers each of the light conversion units.

8. The color conversion assembly of claim 7, further comprising a light scattering layer on a side of the bragg reflective layer remote from the light conversion layer;

preferably, the light scattering layer is one of a microlens and a scattering particle layer; or the surface of the light scattering layer facing the light conversion layer is a concave-convex surface.

9. A display panel, comprising:

the luminous layer comprises a plurality of luminous units and barriers, and the adjacent luminous units are separated from each other through the barriers;

the color conversion assembly according to any one of claims 1 to 8, wherein the color conversion assembly is disposed on the light emitting layer, and each of the light emitting units is disposed opposite to one of the through holes.

10. A method for manufacturing a display panel is characterized by comprising the following steps:

providing a driving backboard with a light-emitting layer, wherein the light-emitting layer comprises a plurality of light-emitting units and barriers, and the adjacent light-emitting units are separated from each other through the barriers;

forming a color conversion component over the light emitting layer, comprising:

forming a retaining wall layer on the light-emitting layer, wherein the retaining wall layer is provided with through holes corresponding to the light-emitting units, and comprises more than two stacked barrier layers so as to gather emergent rays to the centers of the through holes;

and forming a light conversion unit in at least part of the through hole during or after the forming of the retaining wall layer.